Purpose: to document the various Tcl commands available to perform functions for which programmers commonly think they need external commands.

   * [clock] instead of external commands for date or time
   * [glob] instead of external commands for file listing commands like dir or ls
   * [file] copy, delete, rename...
   * [open]/[read]/[close] instead of external commands for reading files
   * [tcllib]'s [fileutil] has procs for cat, find, and grep
   * while it isn't built in, see [tail] for info on doing basic 'read me the end of a file' type processing.
   * [auto_execok] is handy for platform independant shell execution of commands.

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See also [What should I be sure to do so my Tcl based programs run cross platform]

On the C level, see: [Tcl Portable Runtime Library], which is the foundation to the Tcl level commands listed above.
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